/*
   Copyright (c) 2007-9, iUI Project Members
   See LICENSE.txt for licensing terms
   Version 0.40-dev2
 */


(function() {

    var slideSpeed = 20;
    var slideInterval = 0;

    var currentPage = null;
    var currentDialog = null;
    var currentWidth = 0;
    var currentHeight = 0;
    var currentHash = location.hash;
    var hashPrefix = "#_";
    var pageHistory = [];
    var newPageCount = 0;
    var checkTimer;
    var hasOrientationEvent = false;
    var portraitVal = "portrait";
    var landscapeVal = "landscape";

    // *************************************************************************************************

    window.iui =
{
    animOn: true, // Slide animation with CSS transition is now enabled by default where supported

    httpHeaders: {
        "X-Requested-With": "XMLHttpRequest"
    },

    // not original iui function!!
    getCurrentPageId: function() {
        return (currentPage != null) ? currentPage.getAttribute("id") : null;        
    },

    showPage: function(page, backwards) {

        if (page) {
            //			if (window.iui_ext)	window.iui_ext.injectEventMethods(page);	// TG

            if (currentDialog) {
                currentDialog.removeAttribute("selected");
                // EVENT blur->currentDialog
                sendEvent("blur", currentDialog);
                currentDialog = null;
            }

            if (hasClass(page, "dialog")) {
                // EVENT focus->page
                sendEvent("focus", page);
                showDialog(page);
            }
            else {
                sendEvent("load", page);    // 127(stylesheet), 128(script), 129(onload)
                // 130(onFocus), 133(loadActionButton)
                var fromPage = currentPage;
                // EVENT blur->currentPage
                sendEvent("blur", currentPage);
                currentPage = page;
                // EVENT focus->currentPage
                sendEvent("focus", page);

                if (fromPage) {
                    if (backwards) sendEvent("unload", fromPage);
                    setTimeout(slidePages, 0, fromPage, page, backwards);
                }
                else {
                    updatePage(page, fromPage);
                }

            }
        }
    },

    showPageById: function(pageId) {
        var page = $(pageId);
        if (page) {
            var index = pageHistory.indexOf(pageId);
            var backwards = index != -1;
            if (backwards) {
                // we're going back, remove history from index on
                // remember - pageId will be added again in updatePage
                pageHistory.splice(index);
            }

            iui.showPage(page, backwards);
        }
    },

    goBack: function() {
        pageHistory.pop(); // pop current page
        var pageID = pageHistory.pop();  // pop/get parent
        var page = $(pageID);
        iui.showPage(page, true);
    },

    showPageByHref: function(href, args, method, replace, cb) {
        // I don't think we need onerror, because readstate will still go to 4 in that case
        function spbhCB(xhr) {
            if (xhr.readyState == 4) {
                // Add 'if (xhr.responseText)' to make sure we have something???
                var frag = document.createElement("div");
                frag.innerHTML = xhr.responseText;
                // EVENT beforeInsert->body
                sendEvent("beforeinsert", document.body, { fragment: frag, href: href, args: args });
                if (replace) {
                    replaceElementWithFrag(replace, frag);
                }
                else {
                    iui.insertPages(frag);
                }
                if (cb)
                    setTimeout(cb, 1000, true);
            }
        };
        iui.ajax(href, args, method, spbhCB);
    },

    // Callback function gets a single argument, the XHR
    ajax: function(url, args, method, cb) {
        var xhr = new XMLHttpRequest();
        method = method ? method.toUpperCase() : "GET";
        if (args && method == "GET") {
            url = url + "?" + iui.param(args);
        }
        xhr.open(method, url, true);
        if (cb) {
            xhr.onreadystatechange = function() {
                if (onResponseReady && !onResponseReady(xhr)) {
                    return;
                }
                cb(xhr);
            };
        }
        var data = null;
        if (args && method != "GET") {
            xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            data = iui.param(args);
        }
        for (var header in iui.httpHeaders) {
            xhr.setRequestHeader(header, iui.httpHeaders[header]);
        }
        xhr.send(data);
    },

    // Thanks, jQuery
    //	stripped-down, simplified, object-only version
    param: function(o) {
        var s = [];

        // Serialize the key/values
        for (var key in o)
            s[s.length] = encodeURIComponent(key) + '=' + encodeURIComponent(o[key]);

        // Return the resulting serialization
        return s.join("&").replace(/%20/g, "+");
    },

    insertPages: function(frag) {
        var nodes = frag.childNodes;
        var targetPage;
        for (var i = 0; i < nodes.length; ++i) {
            var child = nodes[i];
            if (child.nodeType == 1) {
                if (!child.id)
                    child.id = "__" + (++newPageCount) + "__";

                var clone = $(child.id);
                var docNode;
                if (clone) {
                    clone.parentNode.replaceChild(child, clone);
                    docNode = $(child.id);
                }
                else
                    docNode = document.body.appendChild(child);

                sendEvent("afterinsert", document.body, { insertedNode: docNode });


                if (child.getAttribute("selected") == "true" || !targetPage)
                    targetPage = child;

                --i;
            }
        }
        if (targetPage)
            iui.showPage(targetPage);

    },

    getSelectedPage: function() {
        for (var child = document.body.firstChild; child; child = child.nextSibling) {
            if (child.nodeType == 1 && child.getAttribute("selected") == "true")
                return child;
        }
    },
    isNativeUrl: function(href) {
        for (var i = 0; i < iui.nativeUrlPatterns.length; i++) {
            if (href.match(iui.nativeUrlPatterns[i])) return true;
        }
        return false;
    },
    nativeUrlPatterns: [
		new RegExp("^http:\/\/maps.google.com\/maps\?"),
		new RegExp("^mailto:"),
		new RegExp("^tel:"),
		new RegExp("^http:\/\/www.youtube.com\/watch\\?v="),
		new RegExp("^http:\/\/www.youtube.com\/v\/"),
		new RegExp("^javascript:"),

	],
    hasClass: function(self, name) {
        var re = new RegExp("(^|\\s)" + name + "($|\\s)");
        return re.exec(self.getAttribute("class")) != null;
    },

    addClass: function(self, name) {
        if (!iui.hasClass(self, name)) self.className += " " + name;
    },

    removeClass: function(self, name) {
        if (iui.hasClass(self, name)) {
            var reg = new RegExp('(\\s|^)' + name + '(\\s|$)');
            self.className = self.className.replace(reg, ' ');
        }
    }
};

    // *************************************************************************************************

    addEventListener("load", function(event) {
        var page = iui.getSelectedPage();
        var locPage = getPageFromLoc();

        if (page)
            iui.showPage(page);

        if (locPage && (locPage != page))
            iui.showPage(locPage);

        setTimeout(preloadImages, 0);
        if (typeof window.onorientationchange == "object") {
            window.onorientationchange = orientChangeHandler;
            hasOrientationEvent = true;
            setTimeout(orientChangeHandler, 0);
        }
        setTimeout(checkOrientAndLocation, 0);
        checkTimer = setInterval(checkOrientAndLocation, 300);
    }, false);

    addEventListener("unload", function(event) {
        return;
    }, false);

    addEventListener("click", function(event) {
        var link = findParent(event.target, "a");
        if (link) {
            function unselect() { link.removeAttribute("selected"); }

            if (link.href && link.hash && link.hash != "#" && !link.target) {
                link.setAttribute("selected", "true");
                iui.showPage($(link.hash.substr(1)));
                setTimeout(unselect, 500);
            }
            else if (link == $("backButton")) {
                iui.goBack();
            }
            else if (link.getAttribute("type") == "submit") {
                var form = findParent(link, "form");
                if (form.target == "_self") {
                    form.submit();
                    return;  // allow default
                }
                submitForm(form);
            }
            else if (link.getAttribute("type") == "cancel") {
                cancelDialog(findParent(link, "form"));
            }
            else if (link.target == "_replace") {
                link.setAttribute("selected", "progress");
                iui.showPageByHref(link.href, null, "GET", link, unselect);
            }
            else if (iui.isNativeUrl(link.href)) {
                return;
            }
            else if (link.target == "_webapp") {
                location.href = link.href;
            }
            else if (!link.target) {
                link.setAttribute("selected", "progress");
                iui.showPageByHref(link.href, null, "GET", null, unselect);
            }
            else
                return;

            event.preventDefault();
        }
    }, true);

    addEventListener("click", function(event) {
        var div = findParent(event.target, "div");
        if (div && hasClass(div, "toggle")) {
            div.setAttribute("toggled", div.getAttribute("toggled") != "true");
            event.preventDefault();
        }
    }, true);


    function sendEvent(type, node, props) {
        if (node) {
            var event = document.createEvent("UIEvent");
            event.initEvent(type, false, false);  // no bubble, no cancel
            if (props) {
                for (i in props) {
                    event[i] = props[i];
                }
            }
            node.dispatchEvent(event);
        }
    }

    function getPageFromLoc() {
        var page;
        var result = location.hash.match(/#_([^\?_]+)/);
        if (result)
            page = result[1];
        if (page)
            page = $(page);
        return page;
    }

    function orientChangeHandler() {
        var orientation = window.orientation;
        switch (orientation) {
            case 0:
                setOrientation(portraitVal);
                break;

            case 90:
            case -90:
                setOrientation(landscapeVal);
                break;
        }
    }


    function checkOrientAndLocation() {
        if (!hasOrientationEvent) {
            if ((window.innerWidth != currentWidth) || (window.innerHeight != currentHeight)) {
                currentWidth = window.innerWidth;
                currentHeight = window.innerHeight;
                var orient = (currentWidth < currentHeight) ? portraitVal : landscapeVal;
                setOrientation(orient);
            }
        }

        if (location.hash != currentHash) {
            var pageId = location.hash.substr(hashPrefix.length);
            iui.showPageById(pageId);
        }
    }

    function setOrientation(orient) {
        document.body.setAttribute("orient", orient);
        //  Set class in addition to orient attribute:
        if (orient == portraitVal) {
            iui.removeClass(document.body, landscapeVal);
            iui.addClass(document.body, portraitVal);
        }
        else if (orient == landscapeVal) {
            iui.removeClass(document.body, portraitVal);
            iui.addClass(document.body, landscapeVal);
        }
        else {
            iui.removeClass(document.body, portraitVal);
            iui.removeClass(document.body, landscapeVal);
        }
        setTimeout(scrollTo, 100, 0, 1);
    }

    function showDialog(page) {
        currentDialog = page;
        page.setAttribute("selected", "true");

        if (hasClass(page, "dialog"))
            showForm(page);
    }

    function showForm(form) {
        form.onsubmit = function(event) {
            //  submitForm and preventDefault are called in the click handler
            //  when the user clicks the submit a.button
            // 
            event.preventDefault();
            submitForm(form);
        };

        form.onclick = function(event) {
            // Why is this code needed?  cancelDialog is called from
            // the click hander.  When will this be called?
            if (event.target == form && hasClass(form, "dialog"))
                cancelDialog(form);
        };
    }

    function cancelDialog(form) {
        form.removeAttribute("selected");
    }

    function updatePage(page, fromPage) {
        if (!page.id)
            page.id = "__" + (++newPageCount) + "__";

        location.hash = currentHash = hashPrefix + page.id;
        pageHistory.push(page.id);

        var pageTitle = $("pageTitle");
        if (page.title)
            pageTitle.innerHTML = page.title;
        var ttlClass = page.getAttribute("ttlclass");
        pageTitle.className = ttlClass ? ttlClass : "";

        if (page.localName.toLowerCase() == "form" && !page.target)
            showForm(page);

        var backButton = $("backButton");
        if (backButton) {
            var prevPage = $(pageHistory[pageHistory.length - 2]);
            if (prevPage && !page.getAttribute("hideBackButton")) {
                backButton.style.display = "inline";
                backButton.innerHTML = prevPage.title ? prevPage.title : "Back";
                var bbClass = prevPage.getAttribute("bbclass");
                backButton.className = (bbClass) ? 'button ' + bbClass : 'button';
            }
            else
                backButton.style.display = "none";
        }
    }

    function slidePages(fromPage, toPage, backwards) {
        var axis = (backwards ? fromPage : toPage).getAttribute("axis");

        clearInterval(checkTimer);

        sendEvent("beforetransition", fromPage, { out: true });
        sendEvent("beforetransition", toPage, { out: false });
        if (canDoSlideAnim() && axis != 'y') {
            slide2(fromPage, toPage, backwards, slideDone);
        }
        else {
            slide1(fromPage, toPage, backwards, axis, slideDone);
        }

        function slideDone() {
            if (!hasClass(toPage, "dialog"))
                fromPage.removeAttribute("selected");
            checkTimer = setInterval(checkOrientAndLocation, 300);
            setTimeout(updatePage, 0, toPage, fromPage);
            fromPage.removeEventListener('webkitTransitionEnd', slideDone, false);
            sendEvent("aftertransition", fromPage, { out: true });
            sendEvent("aftertransition", toPage, { out: false });

        }
    }

    function canDoSlideAnim() {
        return (iui.animOn) && (typeof WebKitCSSMatrix == "object");
    }

    function slide1(fromPage, toPage, backwards, axis, cb) {
        if (axis == "y")
            (backwards ? fromPage : toPage).style.top = "100%";
        else
            toPage.style.left = "100%";

        scrollTo(0, 1);
        toPage.setAttribute("selected", "true");
        var percent = 100;
        slide();
        var timer = setInterval(slide, slideInterval);

        function slide() {
            percent -= slideSpeed;
            if (percent <= 0) {
                percent = 0;
                clearInterval(timer);
                cb();
            }

            if (axis == "y") {
                backwards
				? fromPage.style.top = (100 - percent) + "%"
				: toPage.style.top = percent + "%";
            }
            else {
                fromPage.style.left = (backwards ? (100 - percent) : (percent - 100)) + "%";
                toPage.style.left = (backwards ? -percent : percent) + "%";
            }
        }
    }


    function slide2(fromPage, toPage, backwards, cb) {
        toPage.style.webkitTransitionDuration = '0ms'; // Turn off transitions to set toPage start offset
        // fromStart is always 0% and toEnd is always 0%
        // iPhone won't take % width on toPage
        var toStart = 'translateX(' + (backwards ? '-' : '') + window.innerWidth + 'px)';
        var fromEnd = 'translateX(' + (backwards ? '100%' : '-100%') + ')';
        toPage.style.webkitTransform = toStart;
        toPage.setAttribute("selected", "true");
        toPage.style.webkitTransitionDuration = '';   // Turn transitions back on
        function startTrans() {
            fromPage.style.webkitTransform = fromEnd;
            toPage.style.webkitTransform = 'translateX(0%)'; //toEnd
        }
        fromPage.addEventListener('webkitTransitionEnd', cb, false);
        setTimeout(startTrans, 0);
    }

    function preloadImages() {
        var preloader = document.createElement("div");
        preloader.id = "preloader";
        document.body.appendChild(preloader);
    }

    function submitForm(form) {
        iui.addClass(form, "progress");
        iui.showPageByHref(form.action, encodeForm(form), form.method || "GET", null, clear);
        function clear() { iui.removeClass(form, "progress"); }
    }

    function encodeForm(form) {
        function encode(inputs) {
            for (var i = 0; i < inputs.length; ++i) {
                if (inputs[i].name)
                    args[inputs[i].name] = inputs[i].value;
            }
        }

        var args = {};
        encode(form.getElementsByTagName("input"));
        encode(form.getElementsByTagName("textarea"));
        encode(form.getElementsByTagName("select"));
        encode(form.getElementsByTagName("button"));
        return args;
    }

    function findParent(node, localName) {
        while (node && (node.nodeType != 1 || node.localName.toLowerCase() != localName))
            node = node.parentNode;
        return node;
    }

    function hasClass(self, name) {
        return iui.hasClass(self, name);
    }

    function replaceElementWithFrag(replace, frag) {
        var page = replace.parentNode;
        var parent = replace;
        while (page.parentNode != document.body) {
            page = page.parentNode;
            parent = parent.parentNode;
        }
        page.removeChild(parent);

        var docNode;
        while (frag.firstChild) {
            docNode = page.appendChild(frag.firstChild);
            sendEvent("afterinsert", document.body, { insertedNode: docNode });
        }
    }

    function $(id) { return document.getElementById(id); }
    function ddd() { console.log.apply(console, arguments); }

    function ScreenWidth() { return currentWidth; }
    function ScreenHeight() { return currentHeight; }

    function onResponseReady(req) {
        //Reload the page. location.replace actually removes the previous page from the history
        if (req.status == 500) {
            sendEvent("InternalServerError", document.body, { request: req });
            return false;
        }
        return true;
    }
})();
